Radiation curing process

The following mechanism has been proposed to explain the kinetics of the radiation curing process for elastomeric polyurethanes and polythio ethers. 

Carroy, A. C., Conference Proceedings of 19th Technology Days in Radiation Curing Process and Systems, Le Mans, France, May 22-28 (1998). 

There are basically two types of epoxy acrylate resins used in formulating adhesive systems. One is a vinyl ester resin that is used in two-component adhesive formulations much as a DGEB A epoxy or a polyester resin is. The other is a special type of resin that is used in radiation cure processes. This latter type of epoxy acrylate does not have any free epoxy groups, but reacts through its unsaturation. 

Although the basis and end result of the radiation curing process is essentially the same using either electron or ultraviolet energy, the mechanisms are quite different. This is because the energy of electrons is about 50,000 times... 

Study of the radiation curing process ofepoxy resins using cationic photoinitiators... 

As an alternative to the conventional polyethylene glycol (PEG) treatment of waterlogged wood see Chapter 8), attempts were made in 1966-1967 to apply a radiation-curing process (i, 2). The aim was to reduce treatment time and achieve more stability for treated objects subjected to interior climatic changes. The impregnation of waterlogged wood by immersion involves a liquid-liquid exchange process. Dry wood was directly bulked by monomers by a vacuum-pressure process. 

Chapter 11 Radiation Curing Process A Green Route for High-Performance... 

Examination of the contamination of surfeces using IMS measurements was also described by Seng, who was concerned with quality control in curing of surface films. An IMS analyzer was used to detect trace amounts of coating and ink components that remained unlinked during the ultraviolet (UV) radiation curing process. ... 

Photoinitiators like thioxanthonium salts, which are used for adhesives for food packaging and various additives used in the radiation-curing process. 

In radiation curing processes, addition reactions are activated by various forms of radiation infrared, microwave, radio frequency, gamma rays, ultraviolet (UV), and electron beam [2,3]. Basically, the energies of the first three are such that they simply thermally activate the system, that is, heat it, and are used in conjunction with the usual free-radical initiators. 

Details are given of the development of a technique for the direct evaluation of volatile organic compounds during the radiation curing process. This method was used to evaluate the release of benzaldehyde from commercially available alpha-hydroxyketones during curing. 8 refs. 

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